Positive knock

[MightyMouse95]

Got a 2015 Mustang with a roush 2.3 blower on in. Tuned by Lund. I’m having a problem with positive knock up to 8 degrees when normal driving and turning the steering wheel in the slightest. The knock hangs and slowly drops down to 0, or I can let off the throttle and it instantly drops. Not seeing any positive knock at WOT though, any ideas what’s causing the false knock?

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[ypena02]

Do you have long tube headers? They are a common source of false knock.

 

[MightyMouse95]

Do you have long tube headers? They are a common source of false knock.

Nope not yet

 

[Jackson1320]

It might not be false knock part throttle knock is a common tuning problem. Have you spoke with Lund

 

[ypena02]

Have you added an octane booster such as Boostane to confirm that it is false knock?

 

[MightyMouse95]

It might not be false knock part throttle knock is a common tuning problem. Have you spoke with Lund

I did, they told me to check my steering shaft

 

[MightyMouse95]

Have you added an octane booster such as Boostane to confirm that it is false knock?

I did

 

[Whitedevil95]

I am confused you are talking about part throttle driving? How does it perform under WOT conditions?

 

[Jackson1320]

I did, they told me to check my steering shaft

Why. if there’s saying that they must know something

 

[MightyMouse95]

I am confused you are talking about part throttle driving? How does it perform under WOT conditions?

WOT is fine, part throttle like just cruising is where I’m getting knock.

 

[Jordan @ Lethal]

Why. if there’s saying that they must know something

They're probably only telling to check it to make sure it's perfectly tight. The knock sensors in these cars are crazy sensitive and often times the exhaust gets rattled loose causing them to activate. The fact that it's happening at low throttle is likely indicative of something a bit loose that's attached to the engine.

Is it happening around 2K rpm? That tends to be a rough/harsh part of the power band.

 

[MightyMouse95]

They're probably only telling to check it to make sure it's perfectly tight. The knock sensors in these cars are crazy sensitive and often times the exhaust gets rattled loose causing them to activate. The fact that it's happening at low throttle is likely indicative of something a bit loose that's attached to the engine.

Is it happening around 2K rpm? That tends to be a rough/harsh part of the power band.

Rpm doesn’t really matter, but I’d say so, I can have it at cruise going 60-70 and it’ll do it. But going WOT in a straight line never sees positive knock.

 

[MightyMouse95]

Why. if there’s saying that they must know something

My guess since is has to do with me turning

 

[Jackson1320]

My guess since is has to do with me turning

What if you are not moving. Just in gear but stopped and turn the wheels?

 

[MightyMouse95]

What if you are not moving. Just in gear but stopped and turn the wheels?

Nothing at all

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